The fully automatic inner and outer bag tea packaging machine is a high-end and highly automated piece of equipment in the tea packaging industry. It completes the inner bag packaging and outer bag sealing in one go, and is typically used for high-end tea bags, gift teas, etc.
Below is a detailed analysis of the structure and working principle of this equipment.
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I. Equipment Introduction
The fully automatic inner and outer bag tea packaging machine is a machine that integrates inner bag packaging (usually filter paper bags or nylon triangular bags for brewing tea) and outer bag packaging (usually aluminum foil bags or color-printed plastic bags for preservation and display) into an automated production line. It uses bulk tea, inner bag roll film, and outer bag roll film as raw materials, and ultimately outputs independent, complete inner and outer bag finished products.
II. Main Structural Components
This machine can be seen as a precise combination of an inner bag packaging machine and an outer bag packaging machine, uniformly commanded by an intelligent control system. Its structure mainly includes:
1. Inner Bag Packaging Unit
This part is similar to a standard vertical tea bag packaging machine.
• Inner Bag Film Roll Holder: Holds rolls of inner packaging materials (such as filter paper, heat-sealing cotton thread, and label paper).
• Inner Bag Forming Unit: Rolls flat film into a cylindrical shape.
• Inner Bag Quantitative Filling System: A high-precision screw or measuring cup fills a measured amount of tea leaves into the inner bag.
• Inner Bag Longitudinal and Transverse Sealing Device: Performs the initial sealing and final sealing of the inner bag, forming an individual tea bag. Many models also perform the functions of attaching threads and labels at this step.
2. Inner Bag Conveying and Turning System
• Conveyor Belt or Robotic Arm: Smoothly transports the completed inner bags (tea bags) to the outer bag packaging unit.
• Turning and Positioning Mechanism: Ensures that the inner bag is placed into the outer bag in the correct orientation and position.
3. Outer Bag Packaging Unit
This part is similar to a small vertical packaging machine, but the filling material is the inner bag tea bag.
• Outer Bag Film Roll Holder: Holds rolls of outer packaging material (such as aluminum foil composite film, color-printed plastic film).
• Outer Bag Forming Unit: Rolls the outer packaging film into a cylindrical shape.
• Inner Bag Feeding Device: Uses a robotic arm or pusher to accurately push the conveyed inner bag tea bag into the formed outer bag cylinder.
• Outer Bag Longitudinal and Transverse Sealing Device: Seals the outer bag longitudinally and laterally, completely sealing the inner bag inside.
4. Power and Transmission System
• Main Motor and Servo/Stepper Motor System: Provides precise synchronous motion control, ensuring perfect matching of the rhythm of inner bag production, conveying, and outer bag packaging.
• Cams, Linkages, Gears, and other mechanical structures: Convert the rotary motion of the motor into various complex linear or intermittent motions.
5. Core Control System
• PLC (Programmable Logic Controller): The brain of the entire machine, coordinating the actions of the inner and outer bag units and the conveying system to ensure accurate synchronization.
• Human-Machine Interface (Touchscreen): Used for setting parameters (such as inner/outer bag length, temperature, filling amount, etc.), monitoring operating status, and diagnosing faults.
• Multiple Sensors: Photoelectric sensors detect film labels and material positions; temperature sensors monitor sealing temperature; proximity switches detect mechanical positions, etc.
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III. Workflow and Principle
Its working principle is a continuous, synchronous, and precise cyclical process, which can be broken down into the following key steps:
Step 1: Inner Bag Production and Sealing
1. Inner Bag Production: The inner bag roll film is rolled into a cylindrical shape by a forming device, and the longitudinal sealing device seals its back seam.
2. Quantitative Filling: A precise metering device fills the inner bag cylinder with tea leaves.
3. Horizontal Sealing and Forming: The horizontal sealing device performs horizontal sealing, simultaneously sealing the top of the previous inner bag and the bottom of the next inner bag, and then cutting it to form a complete, independent inner bag tea bag. This process often includes simultaneous hanging and labeling.
Step 2: Inner Bag Conveying and Positioning
1. Grabbing and Transfer: A robotic arm or conveyor belt picks up the formed inner bag tea bags and smoothly transports them to the feeding station of the outer bag packaging unit.
2. Precise Positioning: Ensures the inner bag tea bags are positioned in a preset orientation (e.g., label facing up) to be placed into the outer bag.
Step 3: Outer Bag Production and Sealing
1. Outer Bag Forming: Simultaneously, the outer bag roll film is rolled into a cylindrical shape by another forming device and longitudinally sealed.
2. Inner Bag Insertion: When the outer bag cylinder moves to the feeding station and pauses, the insertion device accurately pushes the inner bag tea bags into the outer bag cylinder.
3. Outer Bag Sealing and Cutting: The outer bag’s transverse sealing device transversely seals and cuts the outer bag containing the inner bag. This produces a complete, sealed tea product with both inner and outer bags.
Step 4: Finished Product Output
1. The finished product is collected into a container via a chute or conveyor belt.
IV. Equipment Features and Advantages
* **Ultra-High Automation:** Completes inner and outer bag packaging in one pass, significantly saving labor and time costs.
* **Hygienic and Clean:** From raw materials to finished product, no human contact is required, meeting food hygiene standards.
* **High Packaging Precision:** Servo system control ensures highly accurate positioning and measurement at every stage.
* **Uniform and Aesthetically Pleasing Appearance:** Machine-packaged products are neat, well-sealed, and enhance product quality.
* **Highly Efficient Production:** Speeds can reach dozens or even hundreds of bags per minute, resulting in extremely high production efficiency.
Summary
The fully automatic inner and outer bag tea packaging machine perfectly integrates the two independent processes of inner and outer bag packaging into a continuous flow through a precise mechanical structure, reliable pneumatic or electric actuators, and an intelligent electronic control system. Its core working principle is “synchronization” and “precision,” ensuring that the inner bag is accurately placed into the forming outer bag the instant it is produced, and ultimately sealed into a complete product. This is an indispensable key piece of equipment for modern large-scale, branded tea production.
Post time: Nov-27-2025